Newtons Second Law of Acceleration

Chapter 6 Newtons Second Law of Motion-Force and Acceleration The Big Idea An object accelerates when a net tweet acts on it. 6. 1 Force Causes Acceleration Unbalanced forces performing on an object cause the object to accelerate. The combination of foces acting on an object is net force speedup depends in net force. Doubling the force on an object doubles its acceleration. An objects acceleration is directly proportional to the net force acting on it. . 2 Mass Resists Acceleration For a constant force, an increase in the mass will result in a decrease it the acceleration. The like force applied to twice as much mass result is only half the acceleration. For a habituated force, the acceleration produced is inversely proportional to the mass. inversely means that the two values change in opposite niduss. 6. 3 Newtons Second Law Newtons second uprightness states that the acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, is in the resembling direction as the net force, and is inversely proportional to the mass of the object. Newtons second law describes the relationship among an objects mass, an objects acceleration, and the net force on an object. In equation form, Newtons second law is written as follows Acceleration is equal to the net force divided by the mass. 6. 4 Friction The force of friction between the surfaces depends on the kinds of material in contact and how the surfaces are pressed together. Friction acts on materials that are in contact with each other, and it always acts in a direction to oppose relative motion. Liquids and gases are called fluids because they flow. Fluid friction occurs when an object moves through a fluid. ship resistance is the friction acting on something moving through air. Chapter 6 Newtons Second Law of Motion-Force and Acceleration 6. Applying ForcePressure For a constant force, an increase in the area of contact will result in a decrease in the pressure. Pressure is the amount of force per unit of area. In equation form, pressure is defined as follows pressure =force/ area of application or P= F/A Pressure is calculated in newtons per square meter, or pascals (Pa). One newton per square meter is equal to one pascal The smaller the area supporting a given force, the greater the pressure on that surface. . 6 Free Fall Explained All freely falling objects fall with the same acceleration because the net force on an object is only its weight, and the ratio of weight to mass is the same for all objects. A 10-kg cannonball and a 1-kg stone dropped from an elevated position at the same time will fall together and strike the ground at practically the same time Since mass and weight are proportional, a 10-kg cannonball experiences 10 times as much gravitational force as a 1-kg stone. . 7 Falling and Air Resistance The air resistance force an object experiences depends on the objects speed and area. The force due to a ir resistance diminishes the net force acting on falling objects. store speed is the speed at which the acceleration of a falling object is zero because friction balances the weight. Terminal velocity is terminal speed together with the direction of motion.